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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Hemosiderin is an iron-complex which is grabbed up by the macrophages, the scavenger cells of the body. Hemosiderin forms after trauma or hemorrhage as it results from the break down of red blood cells. Hemosiderin causes the yellow-brown pigmentation one sees as a bruise is healing.